diff --git a/Dockerfile b/Dockerfile
index 93fbc14..905f640 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,7 @@
 FROM alerta/alerta-web:8.3.3
 
+RUN /venv/bin/pip install dnspython==2.1.0
+
 RUN /venv/bin/pip install git+https://github.com/alerta/alerta-contrib.git#subdirectory=integrations/mailer
 
 RUN /venv/bin/pip install git+https://github.com/alerta/alerta-contrib.git#subdirectory=plugins/rocketchat